Beckett will extend himself to about 55 pitches on Tuesday at Coors Field, throwing all of his pitches. On Saturday in San Francisco, he will throw some type of simulated game, the format of which is still being determined.
After that, he will get back to a schedule of pitching every five days, though it hasn't been set in stone when he will start an official Minor League rehab assignment. Beckett last pitched for the Red Sox on May 18, leaving the Yankee Stadium mound that night with a lower back strain.
On May 28, he tweaked his lat muscle during a side session, and it's been a slow build-up since then. But Beckett is making forward progress again.
"He did real well [Monday] and he feels real well today, so that's good," said Red Sox manager Terry Francona.